Improved die for making chord-bar heads



waited fitmefigment demise.

Letters Patent No. 101,529, dated April 5, L870.

IMPROVED DIE FOR MAKING- CHORD-BAR HEADS.

The Schedule referred to in these Ii'ettazs Patent and making part ofthe same.

To all whom "it may concern Be it known that I, FREDERICK J. SMITH, ofthe city of Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Dies for Chord-Bar Heads; and Ido declare that the following is a true and accurate descriptionthereof, reference being bad to the. accompanying drawings and to theletters of reference marked thereon, and being a part of thisspecification.

Figure 1 is an end view of the dies, with a chordbar head between themreceiving shape, and

Figure 2 is a side elevation of the same.

The object of this improvement is the making of chord-bar heads for ironbridges more rapidly than by the usual process, and to make them notonlyat less expense, but of greater strength, with the same weight of metal,than heretofore; and

The nature of the invention consists in the application of the diesherein described to the faces, re-

spectively, of a steam or other power hammer, and of a proper anvil, forthe purpose of manufacturingchord-bar heads.

In the drawings- A is the die attached to the hammer-face by the tongueat, and provided with the shape B, of a form nearly semi-elliptical infront outline, and A is the die attached to the anvil-face by the tonguea, and provided with the shape B, of of B. y

The shapes B and 13', whose openings face each other, are recessed orcut away in the front of the dies for a'suitable distance, so that, whenthe bodies of the dies meet on the line 0 c, the shapes B and B areseparatedsuch a distance as will receive between them thefinishedchord-ba'r head, leaving room upon,

form similar to that,

one side for the chord-bar proper, b, and upon the other for its pointb.

d and d are faces made in the rear ends of the dies A and Arespectively, by cutting them away upon their sides fora portion oftheir leugtlnin lines curved inwardly, so as to leave said faces ofabout one-fourth of the entire width of said dies.

In operation, I take scrap-iron, pile and shingle it into billets ofsuitable size, heat the same sufficiently, and forge into bars havingthe general outlines of the finished bars and beads, by means of thefaces 0 and e and (Z and d. The heads are then placed between the dies,and by repeated blows brought into the desired size, shape, and finish.

I find, by experience, that the chord-bar heads, made in the usualmanner from bar-iron, will not sustain more than fifty to fifty-fivethousand pounds per inch, while those I manufacture in the way describedsustain from eighty to eighty-five thousaml pounds per inch.

I find, by actual trial, that the cost of manufacture by the use ofthese dies is about one-third of the costof making the chord-bar beadsby the usual process.

Having thus fully set forth the nature and merits of my improvement,

What I claim as my invention, anddesire to secure by Letters Patent, is-

For the manufacture of chord-bar heads, the dies A and A, provided withthe shapes B and B, the

faces 0 and c and (I and d, when constructed as described and shown, andarranged to operate as set forth.

\Vituesses: FREDK. J.

M. VAN ALLEN,

GEO. O. MANcHus'rnn.

SMITH

